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Study on representation for solutions to PDE by elliptic functions and the related problems

Research Project

Project/Area Number 18K03374
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 12020:Mathematical analysis-related
Research InstitutionKyushu Institute of Technology

Principal Investigator

Waka Tohru  九州工業大学, 大学院工学研究院, 准教授 (20454069)

Project Period (FY) 2018-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywords非線形偏微分方程式 / 楕円関数 / 反応拡散系 / 大域的分岐問題 / 線形化固有値問題 / Lameの微分方程式 / 漸近公式 / 第3種楕円積分 / 分岐理論 / ラメの微分方程式 / 変形第3種楕円積分 / 反応拡散方程式 / 大域的分岐 / 楕円型偏微分方程式 / 相平面解析 / 一般化Chafee-Infante問題 / スカラーフィールド方程式 / 不完全楕円積分 / フロント・パルス定常解 / 固有値の決定方程式 / 固有値の漸近公式 / 固有関数の漸近公式 / 分岐構造 / 線形化作用素
Outline of Final Research Achievements

The purpose of the research project is the mathematical analysis related with the theory of reaction diffusion equations (PDEs of parabolic type). In particular, we have mainly used the elliptic functions and the shooting method to give expressions of the steady-state solutions of the problems of the parabolic PDEs.
The linearized eigenvalue problems provide the stability/instability of the steady-state in the framework of the dynamical systems. In the case of the single equations with particular nonlinear terms, have been investigated by the jointwork with Prof. Yasuhito Miyamoto etal. The analytical results for the asymptotics on every eigenpairs in terms of the small diffusion coefficient, have been published as two papers in the international journals.
A boundary value problem for the elliptic PDE describing a MEMS device, has been investigated by the jointwork with Prof. Jong-Shenq Guo etal. The global bifurcation result on has been published in the international journal.

Academic Significance and Societal Importance of the Research Achievements

反応拡散系などの非線形微分方程式について、力学系的観点から解構造の様子を記述することは一般的に困難な問題であり、この方面の研究の多くは数値計算によるアプローチが主導的である。一方、2000年代初頭の小杉・森田・四ツ谷らの研究以降、非線形微分方程式の解を楕円関数を用いて初等的に記述する方法の有用性が再指摘されている。
本研究課題では、四ツ谷氏と申請者の先行研究により継承、整備された楕円関数の解析技法をもとに、反応拡散系の線形化固有値問題の解の記述や微小拡散係数に関する漸近公式に応用した。これはさらなる非線形微分方程式の解析やあるいは背後にあるLameの微分方程式の理解への有用性が期待される。

Report

(7 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (27 results)

All 2024 2023 2022 2021 2020 2019 2018 Other

All Int'l Joint Research (2 results) Journal Article (6 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 6 results,  Open Access: 5 results) Presentation (16 results) (of which Int'l Joint Research: 5 results,  Invited: 14 results) Book (1 results) Funded Workshop (2 results)

  • [Int'l Joint Research] 台湾・淡江大学(その他の国・地域)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] 淡江大学(その他の国・地域 (台湾))

    • Related Report
      2018 Research-status Report
  • [Journal Article] Stability and bifurcation diagram for a shadow Gierer?Meinhardt system in one spatial dimension2024

    • Author(s)
      Kaneko Yuki、Miyamoto Yasuhito、Wakasa Tohru
    • Journal Title

      Nonlinearity

      Volume: 37 Issue: 5 Pages: 055011-055011

    • DOI

      10.1088/1361-6544/ad3596

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Asymptotic formulas of the eigenvalues for the linearization of the scalar field equation2023

    • Author(s)
      Miyamoto Yasuhito、Takemura Haruki、Wakasa Tohru
    • Journal Title

      Proceedings of the Royal Society of Edinburgh: Section A Mathematics

      Volume: 1 Issue: 1 Pages: 1-38

    • DOI

      10.1017/prm.2023.95

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Asymptotic formulas of the eigenvalues for the linearization of a one-dimensional sinh-Poisson equation2023

    • Author(s)
      Aizawa Shuya、Miyamoto Yasuhito、Wakasa Tohru
    • Journal Title

      Journal of Elliptic and Parabolic Equations

      Volume: 9 Issue: 2 Pages: 1043-1070

    • DOI

      10.1007/s41808-023-00233-9

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The structure of stationary solutions to a micro-electro mechanical system with fringing field2020

    • Author(s)
      Guo Jong-Shenq、Huang Bo-Chih、Wakasa Tohru、Wang Chi-Jen、Yu Cherng-Yih
    • Journal Title

      Journal of Differential Equations

      Volume: 269 Issue: 9 Pages: 7676-7704

    • DOI

      10.1016/j.jde.2020.05.041

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A nonlinear parabolic-hyperbolic system for contact inhibition and a degenerate parabolic fisher kpp equation2020

    • Author(s)
      Bertsch Michiel、Hilhorst Danielle、Izuhara Hirofumi、Mimura Masayasu、Wakasa Tohru
    • Journal Title

      Discrete & Continuous Dynamical Systems - A

      Volume: 40 Issue: 6 Pages: 3117-3142

    • DOI

      10.3934/dcds.2019226

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Standing and travelling waves in a parabolic-hyperbolic system2019

    • Author(s)
      M. Bertsch, H. Izuhara, M. Mimura, T. Walasa
    • Journal Title

      Discrete and Continuous Dynamical Systems, Series A

      Volume: 39 Issue: 10 Pages: 5603-5635

    • DOI

      10.3934/dcds.2019246

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Linearized eigenvalue problems, Lame equations, and modified elliptic integrals of the third kind2023

    • Author(s)
      Tohru Wakasa
    • Organizer
      The 13th AIMS Conference on Differential Equations, Dynamical Systems and Applications
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Stability and Bifurcation for 1-dimensional Gierer-Meinhardt shadow system2023

    • Author(s)
      Tohru Wakasa
    • Organizer
      第7回 反応拡散方程式と非線形分散型方程式の解の挙動
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] スカラーフィールド方程式の線形化問題における固有値の明示的表示2023

    • Author(s)
      竹村春希、宮本安人、若狭 徹
    • Organizer
      日本数学会2024年年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 1次元線形化固有値問題、第3種楕円積分とLame方程式2023

    • Author(s)
      若狭 徹
    • Organizer
      さいたま数理解析セミナー
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 線形化固有値問題, 第3種楕円積分と Lameの微分方程式2023

    • Author(s)
      若狭 徹、宮本 安人、竹村 春希、会沢 修也
    • Organizer
      RIMS共同研究(グループ型)「精密解析による非線形問題の新展開」
    • Related Report
      2022 Research-status Report
  • [Presentation] ある空間1次元MEMSモデルの定常解とその安定性2022

    • Author(s)
      若狭 徹
    • Organizer
      九州関数方程式セミナー
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] ある空間1 次元MEMSモデルの定常解につ いて2022

    • Author(s)
      若狭 徹
    • Organizer
      非線型現象のシミュレーションと解析ミニ研究集会2022
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] fringing fieldを考慮した1次元MEMSモデルの定常解構造2022

    • Author(s)
      若狭 徹
    • Organizer
      室蘭工大PDE研究会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] fringing fieldを考慮したMEMSモデルの定常解と安定性2022

    • Author(s)
      若狭 徹
    • Organizer
      第11回室蘭非線形数理研究会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 空間1次元MEMSモデルにおける定常解と安定性解析2021

    • Author(s)
      若狭 徹
    • Organizer
      第2かオンライン放物型偏微分方程式ワークショップ
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Limit Classfication on Eigenfunctions for 1-Dimensional Reaction-Diffusion System2019

    • Author(s)
      T. Wakasa
    • Organizer
      SIAM Conference on Applications of Dynamical Systems
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 反応拡散系と線形化固有値問題2019

    • Author(s)
      若狭 徹
    • Organizer
      松江数理生物学・現象数理学ワークショップ
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Limit Classfication on Eigenfunctions for 1-Dimensional Reaction-Diffusion System2019

    • Author(s)
      若狭 徹
    • Organizer
      SIAM Conference on Applications of Dynamical Systems
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Characterization on eigenvalues and eigenfunctions for 1-dimensional linearized scalar field equations2018

    • Author(s)
      若狭 徹
    • Organizer
      12-th AIMS conference on Dynamical systems, Differential equations and Applications
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 楕円積分計算による線形化固有値問題の解析とその応用2018

    • Author(s)
      若狭 徹
    • Organizer
      九州関数方程式セミナー
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] 1次元スカラーフィールド方程式の線形化固有値問題2018

    • Author(s)
      若狭 徹
    • Organizer
      Nonlinear Evolutionary PDEs and their Equilibrium States II
    • Related Report
      2018 Research-status Report
    • Invited
  • [Book] 理工系学生のための微分方程式2021

    • Author(s)
      岡山友昭,佐藤好久,田上真,若狭徹,廣瀬英雄
    • Total Pages
      181
    • Publisher
      培風館
    • ISBN
      9784563011581
    • Related Report
      2021 Research-status Report
  • [Funded Workshop] Chemotaxis and Nonlinear Parabolic Equations2019

    • Related Report
      2019 Research-status Report
  • [Funded Workshop] RIMS共同研究(公開型)「常微分方程式の定性的理論と数理モデル研究への応用」2018

    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2025-01-30  

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